摘要
硼、氧化硅、硅的混合粉末与氨气在1423K反应生成了氮化硼纳米管.产物用X射线衍射(XRD),透 射电镜(TEM)和傅立叶红外光谱(FTIR)进行了表征.氮化硼纳米管的直径为20～50nm,长达几十微米.氮化硼 纳米管的头部是开口或封口的,没有观察到纳米颗粒被包覆在纳米管的端部.因此,氮化硼纳米管的生长被认为 是一种氧化物辅助生长的机理.同多晶六方氮化硼的红外光谱相比,在1520cm-1处的小吸收峰表现了氮化硼纳 米管的一维结构特征.
Boron nitride (BN) nanotubes were fabricated by heating a mixture of boron, silicon and silica powders in a flowing ammonia gas at 1423 K. The products were examined by X-ray diffractometry (XRD), transmission electron microscopy (TEM) and Fournier transform infrared spectroscopy (FTIR). The diameter of BN nanotubes is in the range of 20 similar to 50 nm. and the length is up to several tens of mu m. BN nanotubes have opened or closed ends and no nanoparticles appeared at the ends of nanotubes. It is suggested that the formation of BN nanotubes could be attributed to an oxide-assisted growth mechanism. In comparison with the infrared spectra of polycrystalline hexagonal BN, an extra small absorbing band appears at 1520 cm(-1) for the as-prepared BN nanotubes, which is related with the one-dimensional nanostructure of BN nanotubes.
基金
SupportedbytheNationalHighTechnologyResearchandDevelopmentProgramofChina(863Program002AA336020)andZhejiangProvincialAnalyzingandTestingFunds(G20030643)
